/*
 * Copyright (C) 2010 Yury Kudryashov.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package name.kudryashov.collections;

import name.kudryashov.base.Argument;
import name.kudryashov.functions.Function;

import java.util.AbstractCollection;
import java.util.Collection;
import java.util.Iterator;

class MappingCollection<T, R> extends AbstractCollection<R> {

    private final Collection<T> c;
    private final Function<? super T, ? extends R> f;

    public MappingCollection(Collection<T> c, Function<? super T,? extends R> f) {
        this.c = Argument.requireNotNull(c, "c");
        this.f = Argument.requireNotNull(f, "f");
    }

    public int size() {
        return c.size();
    }

    public boolean isEmpty() {
        return c.isEmpty();
    }

    public Iterator<R> iterator() {
        return Iterators.map(c.iterator(), f);
    }

    public void clear() {
        c.clear();
    }

    @Override
    public String toString() {
        return "MappingCollection(" + f + ", "  + c + ")";
    }
}
